by the washington, d.c. snipers who killed ten people and wounded three others. investigators say the gun belonged to nancy lanza of newtown, purchased legally in the last few years and used, they say, by her son, adam, who took it to the school after first fatally shooting his mother at the home where they both lived. authorities have not said how she stored the weapons, whether she kept them locked. nancy lanza's sister-in-law, adam lanza's aunt, stays is not unusual for a divorced woman, like nancy, who lived alone, to have them in the house. >> self-defense. she was a female. live aid loan, live nald beautiful neighborhood. >> reporter: but those guns she bought for protection, investigators say you were used by her own son to kill her. former classmates said a dam lanza was an awkward loner, bright, but painfully shy, so stoic says the former head of high school secure that he showed no sign that he felt physical pain. cindy crom berg says she heard all about adam from her son, kyle, who was a classmate. >> felt that he was odd, that there was no question that he was not a mainstream kids, th
